Two former Parramatta Eels players are accused of harbouring semi-automatic weapons and possessing more than half-a-million dollars in cash after dramatic arrests in Sydney's Centennial Park yesterday.

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Mr Turnbull was joined by his deputy Barnaby Joyce, who let the media in on a state secret.

"When we're at cabinet they bring out bowls of nuts and everybody pinches the macadamias," he said.

"So you're left with the cashews."

Before Mr Turnbull's arrival the president of the Hemp Party and WA Senate candidate Michael Balderstone gate-crashed the event, claiming to have an innovative idea to create 100,000 jobs by legalising medicinal cannabis.

"We are legislating for medicinal cannabis," Mr Joyce told him.

"Nothing is happening yet," Mr Balderstone replied, complaining about the slow progress on a NSW trial.

He was removed by AFP officers as Mr Turnbull's convoy arrived, missing his chance to give him an inflatable joint.

The prime minister returned to Sydney where he will face off against Bill Shorten in the third leaders debate - this time on Facebook.